package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServicelmpl implements UserService {

    //微信服务接口地址
    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;


    /*微信登录
    @Override*/
    public User wxLogin(UserLoginDTO userLoginDTO) {
       String openid=getOpenid(userLoginDTO.getCode());
       //String openid="0e3uMn0w3Cark43LrG3w3IHhuY3uMn0g";
       //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if(openid==null){

            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);

        }

        //判断当前用户是否为新用户 TODO 修改
        User user=userMapper.getByOpenid(openid);
        //如果是新用户，自动完成注册
        if(user==null){
            user=User.builder()
                    .openid(openid)
                    .name(userLoginDTO.getName())
                    .avatar(userLoginDTO.getAvatar())
                    .createTime(LocalDateTime.now())
                    .build();
            //TODO 修改
            userMapper.insert(user);
        }
        //返回这个用户对象
        return user;
    }

    /**
     * 通过微信授权码获取微信用户的openid
     *
     * @param code 微信授权码，用于换取openid
     * @return 用户的openid，如果获取失败则返回null
     */
  /*  private String getOpenid(String code){
        //调用微信接口服务，获得当前微信用户的openid
        Map<String,String> map=new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type","authorization_code");
        // 发起HTTP GET请求到微信登录凭证校验接口
        String json=HttpClientUtil.doGet(WX_LOGIN,map);

        // 解析微信服务器返回的JSON数据
        JSONObject jsonObject= JSON.parseObject(json);
        // 从JSON对象中提取openid字段的值
        String openid=jsonObject.getString("openid");
        // 返回用户的openid
        return openid;
    }*/
    /**
     * 通过微信授权码获取微信用户的openid
     *
     * @param code 微信授权码，用于换取openid
     * @return 用户的openid，如果获取失败则返回null
     */
    private String getOpenid(String code) {
        if (code == null || code.isEmpty()) {
            log.error("微信授权码为空");
            return null;
        }

        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");

        try {
            // 调用微信登录接口
            String json = HttpClientUtil.doGet(WX_LOGIN, map);
            JSONObject jsonObject = JSON.parseObject(json);

            // 检查是否有错误信息
            Integer errcode = jsonObject.getInteger("errcode");
            if (errcode != null && errcode != 0) {
                String errmsg = jsonObject.getString("errmsg");
                log.error("调用微信接口失败，错误码: {}, 错误信息: {}", errcode, errmsg);
                return null;
            }

            // 提取openid字段的值
            String openid = jsonObject.getString("openid");
            if (openid == null || openid.isEmpty()) {
                log.error("微信接口返回的JSON数据中未包含openid字段");
                return null;
            }

            return openid;

        } catch (Exception e) {
            log.error("调用微信接口时发生异常", e);
            return null;
        }
    }

}
